Rosanne Cash is accustomed to writing songs from her own perspective, but the singer stepped out of her usual first-person point of view on “Etta’s Tune,” from her new album “The River & the Thread.” Speakeasy today premieres a video of Cash singing the song with her husband, the producer and guitarist John Leventhal, as part of Capitol Records’ “1 Mic 1 Take” performance series.

Cash and her husband, the producer John Leventhal, wrote the tune about the 64-year marriage of Marshall and Etta Grant. Marshall Grant played in Johnny Cash’s band for more than 25 years, and Rosanne Cash has described the bassist as “a surrogate dad.” When the Marshall Grant died in August 2011, Cash Leventhal were inspired to write a song filled with details of their lives, and told from their point of view. The result is a gentle, reverent love song, made all the more fitting for Valentine’s Day by the fact that another loving couple wrote it.

“Content is marrying content, because it’s a story about true love, working with my true love to make it,” Cash said. “It’s hard, and it’s liberating and beautiful and challenging.”

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